The γ/γ′ interfacial dislocation networks in several creep-ruptured superalloys were analyzed. It was found that the morphologies of dislocation networks differed slightly from each other in these alloys. The fourth-generation superalloy had finer dislocation networks and maintained a relatively stable state. By comparison, the interfacial dislocations in the third-generation superalloy exhibited obvious curved features which were associated with possible climb or slip. These interfacial dislocation characteristics could be correlated with the creep behavior of these superalloys.

Interfacial Dislocation Networks Strengthening a Fourth-Generation Single-Crystal TMS-138 Superalloy. J.X.Zhang, T.Murakumo, Y.Koizumi, T.Kobayashi, H.Harada, S.Masaki: Metallurgical and Materials Transactions A, 2002, 33[12], 3741-6